kernel-packages team mailing list archive

[Nikola Nikolov <nikolov.tmw@xxxxxxxxx>]

Hello Christopher,

I've started reverse commit bisecting the kernel and it seems like I'm
on the right track(I already had instances of the bug being present and
being fixed). It does take me a rather significant amount of time(well,
I've read it can be worse, since it takes me about an hour - hour and a
half to build the kernel from source), but I'm hoping to identify the
first good commit over the weekend.

I'm just letting you know that I've started working on it and that I'm
not going to disappear on the bug :)

Nikola

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https://bugs.launchpad.net/bugs/1406767

Title:
  High ACPI event count on Asus K750L, causing ~12% non-stop CPU
  utilization

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This started as soon as I installed Ubuntu when I bought my laptop,
  about 3 months ago. Due to other bugs with the kernel that Ubuntu
  uses, I switched to the latest mainline kernel available and that
  resolved the issue for me. At the time, this was
  3.16.3-031603.201409171435_amd64 . Ubuntu(14.10) itself is using
  3.16.0-28-generic at the moment.

  For only 16 minutes of uptime, cat /sys/firmware/acpi/interrupts/gpe_all yields this: 
  50867044

  Which is over 50 million interrupts. To illustrate the rate at which those events are fired, I ran this command: 
  cat /sys/firmware/acpi/interrupts/gpe_all && sleep 10 && cat /sys/firmware/acpi/interrupts/gpe_all  and the result was: 
  58397255
  58916975

  A little over half a million interrupts in 10 seconds.

  Again - this doesn't happen in the 3.17 kernel. At this point, I'm not
  sure whether this is a regression or if the fix hasn't gotten to
  Ubuntu yet.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-28-generic 3.16.0-28.38
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  Date: Wed Dec 31 15:48:51 2014
  HibernationDevice: RESUME=UUID=7b341f94-cd2e-461a-8b9b-38d1161c43a6
  InstallationDate: Installed on 2014-09-21 (101 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: ASUSTeK COMPUTER INC. X750LN
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=7f1fe8aa-bbe8-435d-979a-261f0331631e ro quiet splash i8042.noloop=1 psmouse.proto=bare acpi_osi= vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  StagingDrivers: keucr
  UpgradeStatus: Upgraded to utopic on 2014-11-05 (55 days ago)
  dmi.bios.date: 02/19/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 201
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X750LN
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr201:bd02/19/2014:svnASUSTeKCOMPUTERINC.:pnX750LN:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX750LN:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: X750LN
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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